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1
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-export default {
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- listeners: [],
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- on(type, handle) {
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- // first remove and add
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- this.off(type, handle);
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-
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- if (typeof handle === 'function') {
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- console.debug(`listen event ${type}`);
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- this.listeners.push([type, handle]);
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- }
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- },
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- off(type, handle) {
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- let index = -1;
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-
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- if (typeof handle === 'function' &&
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- this.listeners.some(([itype, ihandle]) => {
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- index++;
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- return itype === type && handle.name && ihandle.name === handle.name;
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- })
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- ) {
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- this.listeners.splice(index, 1);
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- }
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- },
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- emit(type, ...params) {
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- this.listeners.forEach(([listenType, handle]) => type === listenType && handle(...params));
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- console.debug(`receive event ${type}: ${JSON.stringify(params)}`);
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- },
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- removeAllListeners() {
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- this.listeners = [];
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- }
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31
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-}; |
1
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+/**
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2
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+ * description: 参考借鉴 Node.js 的 EventEmitter
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3
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+ * 对象管理 event 事件
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4
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+ * @func on 监听
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5
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+ * @func emit 触发
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6
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+ * @func once 监听只执行一次
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7
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+ * @func remove 移除某个类型的某个事件
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8
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+ * @func removeAll 移除某个类型的全部事件/所有类型的全部事件
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9
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+ */
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10
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+class EventEmitter {
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11
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+ constructor() {
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12
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+ this._events = Object.create(null);
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13
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+ this._eventsCount = 0;
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14
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+ }
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15
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+
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16
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+ /**
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17
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+ * emit 触发事件
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+ * @param type 事件名
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+ * @param ...args 参数
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+ */
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+ emit(type) {
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22
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+ let events, handler, len, isFn;
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+
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24
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+ events = this._events;
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+ handler = events[type];
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26
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+ console.log(events);
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+
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28
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+ if (!handler)
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29
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+ return false;
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30
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+
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31
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+ isFn = typeof handler === 'function';
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32
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+ len = arguments.length;
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33
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+
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34
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+ // 优化性能
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35
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+ switch(len) {
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36
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+ case 0:
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37
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+ throw new Error('"emit" not have arguments');
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38
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+ break;
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39
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+ case 1:
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40
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+ emitNone(handler, isFn, this);
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41
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+ break;
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42
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+ case 2:
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43
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+ emitOne(handler, isFn, this, arguments[1]);
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44
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+ break;
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45
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+ case 3:
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46
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+ emitTwo(handler, isFn, this, arguments[1], arguments[2]);
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47
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+ break;
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48
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+ case 4:
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49
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+ emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]);
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50
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+ break;
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51
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+ default:
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52
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+ args = new Array(len - 1);
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53
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+ for (let i = 1; i < len; i++) {
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54
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+ args[i - 1] = arguments[i];
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55
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+ }
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56
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+ emitMany(handler, isFn, this, args);
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57
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+ }
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58
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+
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59
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+ return true;
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60
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+ }
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61
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+
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62
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+ one(type, listener,) {
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63
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+ let events;
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64
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+ if (typeof listener !== 'function')
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65
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+ throw new Error('"listener" argument must be a function');
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66
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+
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67
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+ events = this._events;
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68
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+ console.log(events);
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69
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+ if (typeof events === 'undefined') {
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70
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+ events = this._events = Object.create(null);
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71
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+ this._eventsCount = 0;
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72
|
+ }
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73
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+
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74
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+ events[type] = listener;
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75
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+ ++this._eventsCount;
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76
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+ return this;
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77
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+ }
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78
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+
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79
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+ _addListener(type, listener, prepend) {
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80
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+ let events;
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81
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+ let existing;
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82
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+ if (typeof listener !== 'function')
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83
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+ throw new Error('"listener" argument must be a function');
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84
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+
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|
85
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+ events = this._events;
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86
|
+ console.log(events);
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|
87
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+
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|
88
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+ if (typeof events === 'undefined') {
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89
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+ events = this._events = Object.create(null);
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|
90
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+ this._eventsCount = 0;
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|
91
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+ } else {
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92
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+ existing = events[type];
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|
93
|
+ }
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94
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+
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|
95
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+ if (!existing) {
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96
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+ existing = events[type] = listener;
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97
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+ ++this._eventsCount;
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98
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+ } else {
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99
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+ if (typeof existing === 'function') {
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|
100
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+ existing = events[type] = prepend ? [listener, existing] : [existing, listener];
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101
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+ } else if (prepend) {
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102
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+ existing.unshift(listener);
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103
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+ } else {
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104
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+ existing.push(listener);
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105
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+ }
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106
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+ }
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107
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+
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108
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+ return this;
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109
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+ }
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110
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+
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111
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+ /**
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112
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+ * on 监听事件
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113
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+ * @param type 事件名
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114
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+ * @param listener 监听函数
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115
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+ */
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116
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+ on(type, listener) {
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117
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+ return this._addListener(type, listener, false);
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118
|
+ }
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119
|
+
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120
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+ /**
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121
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+ * once 监听只执行一次事件
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122
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+ * @param type 事件名
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123
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+ * @param listener 只执行一次的监听函数
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124
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+ */
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125
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+ once(type, listener) {
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126
|
+ if (typeof listener !== 'function')
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127
|
+ throw new Error('"listener" argument must be a function');
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128
|
+ this.on(type, _onceWrap(this, type, listener));
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|
129
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+ return this;
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|
130
|
+ }
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|
131
|
+
|
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|
132
|
+ /**
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|
133
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+ * prepend 优先监听事件
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|
134
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+ * @param type 事件名
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|
135
|
+ * @param listener 要优先的监听函数
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136
|
+ */
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137
|
+ prepend(type, listener) {
|
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|
138
|
+ return this._addListener(type, listener, true);
|
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|
139
|
+ }
|
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|
140
|
+
|
|
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|
141
|
+ /**
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|
142
|
+ * prependOnce 优先只执行一次的监听事件
|
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|
143
|
+ * @param type 事件名
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|
144
|
+ * @param listener 要优先且只执行一次的监听函数
|
|
|
|
145
|
+ */
|
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|
146
|
+ prependOnce(type, listener) {
|
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|
147
|
+ if (typeof listener !== 'function')
|
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|
|
148
|
+ throw new TypeError('"listener" argument must be a function');
|
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|
|
149
|
+ this.prepend(type, _onceWrap(this, type, listener));
|
|
|
|
150
|
+ return this;
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|
|
151
|
+ }
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|
152
|
+
|
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|
153
|
+ /**
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|
154
|
+ * remove 移除的监听事件
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|
155
|
+ * @param type 事件名
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|
156
|
+ * @param listener 要移除的监听函数（可选）
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|
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|
157
|
+ */
|
|
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|
158
|
+ remove(type, listener) {
|
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|
159
|
+ let list, events, position, originalListener;
|
|
|
|
160
|
+
|
|
|
|
161
|
+ if (typeof listener !== 'function')
|
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|
|
162
|
+ throw new TypeError('"listener" argument must be a function');
|
|
|
|
163
|
+
|
|
|
|
164
|
+ events = this._events;
|
|
|
|
165
|
+ if (!events) {
|
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|
|
166
|
+ return this;
|
|
|
|
167
|
+ }
|
|
|
|
168
|
+
|
|
|
|
169
|
+ list = events[type];
|
|
|
|
170
|
+ if (!list) {
|
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|
|
171
|
+ return this;
|
|
|
|
172
|
+ }
|
|
|
|
173
|
+
|
|
|
|
174
|
+ if (list === listener || list.listener === listener) {
|
|
|
|
175
|
+ if (--this._eventsCount === 0) {
|
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|
|
176
|
+ this._events = Object.create(null);
|
|
|
|
177
|
+ } else {
|
|
|
|
178
|
+ delete events[type];
|
|
|
|
179
|
+ }
|
|
|
|
180
|
+ } else if (typeof list !== 'function') {
|
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|
181
|
+ position = -1;
|
|
|
|
182
|
+
|
|
|
|
183
|
+ for (let i = list.length - 1; i >= 0; i--) {
|
|
|
|
184
|
+ if (list[i] === listener || list[i].listener === listener) {
|
|
|
|
185
|
+ originalListener = list[i].listener;
|
|
|
|
186
|
+ position = i;
|
|
|
|
187
|
+ break;
|
|
|
|
188
|
+ }
|
|
|
|
189
|
+ }
|
|
|
|
190
|
+
|
|
|
|
191
|
+ if (position < 0) {
|
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|
|
192
|
+ return this;
|
|
|
|
193
|
+ }
|
|
|
|
194
|
+
|
|
|
|
195
|
+ if (position === 0) {
|
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|
|
196
|
+ list.shift();
|
|
|
|
197
|
+ } else {
|
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|
|
198
|
+ spliceOne(list, position);
|
|
|
|
199
|
+ }
|
|
|
|
200
|
+
|
|
|
|
201
|
+ if (list.length === 1) {
|
|
|
|
202
|
+ events[type] = list[0];
|
|
|
|
203
|
+ }
|
|
|
|
204
|
+ }
|
|
|
|
205
|
+
|
|
|
|
206
|
+ return this;
|
|
|
|
207
|
+ }
|
|
|
|
208
|
+
|
|
|
|
209
|
+ /**
|
|
|
|
210
|
+ * removeAll 移除某事件名的全部监听事件/移除全部事件名的事件
|
|
|
|
211
|
+ * @param type 事件名
|
|
|
|
212
|
+ */
|
|
|
|
213
|
+ removeAll(type) {
|
|
|
|
214
|
+ let listeners, events;
|
|
|
|
215
|
+
|
|
|
|
216
|
+ events = this._events;
|
|
|
|
217
|
+
|
|
|
|
218
|
+ if (!events)
|
|
|
|
219
|
+ return this;
|
|
|
|
220
|
+
|
|
|
|
221
|
+ if (arguments.length === 0) {
|
|
|
|
222
|
+ var keys = Object.keys(events);
|
|
|
|
223
|
+ var key;
|
|
|
|
224
|
+ for (let i = 0; i < keys.length; ++i) {
|
|
|
|
225
|
+ key = keys[i];
|
|
|
|
226
|
+ this.removeAll(key);
|
|
|
|
227
|
+ }
|
|
|
|
228
|
+ this._events = Object.create(null);
|
|
|
|
229
|
+ this._eventsCount = 0;
|
|
|
|
230
|
+ return this;
|
|
|
|
231
|
+ }
|
|
|
|
232
|
+
|
|
|
|
233
|
+ listeners = events[type];
|
|
|
|
234
|
+
|
|
|
|
235
|
+ if (typeof listeners === 'function') {
|
|
|
|
236
|
+ this.remove(type, listeners);
|
|
|
|
237
|
+ } else if (listeners !== undefined) {
|
|
|
|
238
|
+ for (let i = listeners.length - 1; i >= 0; i--) {
|
|
|
|
239
|
+ this.remove(type, listeners[i]);
|
|
|
|
240
|
+ }
|
|
|
|
241
|
+ }
|
|
|
|
242
|
+
|
|
|
|
243
|
+ return this;
|
|
|
|
244
|
+ }
|
|
|
|
245
|
+
|
|
|
|
246
|
+ eventNames() {
|
|
|
|
247
|
+ return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : [];
|
|
|
|
248
|
+ }
|
|
|
|
249
|
+}
|
|
|
|
250
|
+
|
|
|
|
251
|
+
|
|
|
|
252
|
+const emitNone = (handler, isFn, self) => {
|
|
|
|
253
|
+ if (isFn) {
|
|
|
|
254
|
+ handler.call(self);
|
|
|
|
255
|
+ } else {
|
|
|
|
256
|
+ let len = handler.length;
|
|
|
|
257
|
+ let listeners = arrayClone(handler, len);
|
|
|
|
258
|
+ for (let i = 0; i < len; ++i)
|
|
|
|
259
|
+ listeners[i].call(self);
|
|
|
|
260
|
+ }
|
|
|
|
261
|
+}
|
|
|
|
262
|
+
|
|
|
|
263
|
+const emitOne = (handler, isFn, self, arg1) => {
|
|
|
|
264
|
+ if (isFn) {
|
|
|
|
265
|
+ handler.call(self, arg1);
|
|
|
|
266
|
+ } else {
|
|
|
|
267
|
+ let len = handler.length;
|
|
|
|
268
|
+ let listeners = arrayClone(handler, len);
|
|
|
|
269
|
+ for (let i = 0; i < len; ++i)
|
|
|
|
270
|
+ listeners[i].call(self, arg1);
|
|
|
|
271
|
+ }
|
|
|
|
272
|
+}
|
|
|
|
273
|
+
|
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|
274
|
+const emitTwo = (handler, isFn, self, arg1, arg2) => {
|
|
|
|
275
|
+ if (isFn) {
|
|
|
|
276
|
+ handler.call(self, arg1, arg2);
|
|
|
|
277
|
+ } else {
|
|
|
|
278
|
+ let len = handler.length;
|
|
|
|
279
|
+ let listeners = arrayClone(handler, len);
|
|
|
|
280
|
+ for (let i = 0; i < len; ++i)
|
|
|
|
281
|
+ listeners[i].call(self, arg1, arg2);
|
|
|
|
282
|
+ }
|
|
|
|
283
|
+}
|
|
|
|
284
|
+
|
|
|
|
285
|
+const emitThree = (handler, isFn, self, arg1, arg2, arg3) => {
|
|
|
|
286
|
+ if (isFn) {
|
|
|
|
287
|
+ handler.call(self, arg1, arg2, arg3);
|
|
|
|
288
|
+ } else {
|
|
|
|
289
|
+ let len = handler.length;
|
|
|
|
290
|
+ let listeners = arrayClone(handler, len);
|
|
|
|
291
|
+ for (let i = 0; i < len; ++i)
|
|
|
|
292
|
+ listeners[i].call(self, arg1, arg2, arg3);
|
|
|
|
293
|
+ }
|
|
|
|
294
|
+}
|
|
|
|
295
|
+
|
|
|
|
296
|
+const emitMany = (handler, isFn, self, args) => {
|
|
|
|
297
|
+ if (isFn) {
|
|
|
|
298
|
+ handler.apply(self, args);
|
|
|
|
299
|
+ } else {
|
|
|
|
300
|
+ let len = handler.length;
|
|
|
|
301
|
+ let listeners = arrayClone(handler, len);
|
|
|
|
302
|
+ for (let i = 0; i < len; ++i)
|
|
|
|
303
|
+ listeners[i].apply(self, args);
|
|
|
|
304
|
+ }
|
|
|
|
305
|
+}
|
|
|
|
306
|
+
|
|
|
|
307
|
+const spliceOne = (list, index) => {
|
|
|
|
308
|
+ for (; index + 1 < list.length; index++)
|
|
|
|
309
|
+ list[index] = list[index + 1];
|
|
|
|
310
|
+ list.pop();
|
|
|
|
311
|
+}
|
|
|
|
312
|
+
|
|
|
|
313
|
+function onceWrapper(...args) {
|
|
|
|
314
|
+ if (!this.fired) {
|
|
|
|
315
|
+ this.target.remove(this.type, this.wrapFn);
|
|
|
|
316
|
+ this.fired = true;
|
|
|
|
317
|
+ Reflect.apply(this.listener, this.target, args);
|
|
|
|
318
|
+ }
|
|
|
|
319
|
+}
|
|
|
|
320
|
+
|
|
|
|
321
|
+const _onceWrap = (target, type, listener) => {
|
|
|
|
322
|
+ var state = { fired: false, wrapFn: undefined, target, type, listener };
|
|
|
|
323
|
+ var wrapped = onceWrapper.bind(state);
|
|
|
|
324
|
+ wrapped.listener = listener;
|
|
|
|
325
|
+ state.wrapFn = wrapped;
|
|
|
|
326
|
+ return wrapped;
|
|
|
|
327
|
+}
|
|
|
|
328
|
+
|
|
|
|
329
|
+function arrayClone(arr, n) {
|
|
|
|
330
|
+ var copy = new Array(n);
|
|
|
|
331
|
+ for (var i = 0; i < n; ++i)
|
|
|
|
332
|
+ copy[i] = arr[i];
|
|
|
|
333
|
+ return copy;
|
|
|
|
334
|
+}
|
|
|
|
335
|
+
|
|
|
|
336
|
+const event = new EventEmitter();
|
|
|
|
337
|
+
|
|
|
|
338
|
+export default event; |
